msm: clock-debug: Modify measure logic to account for multiple CCs

In the near future, multiple clock controllers will be
registered, each with their own lookup tables. Modify
the debugfs measure node creation logic to account for
this. The assumption is that there will be one measure
clock that will apply to all clock controllers.

Change-Id: I8d2d7a6df2a7a0228bdc7fbc743d5207f2a1bab0
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>